Grounding and bonding section
If the voltage drop between a grounding electrode and an auxiliary potential electrode is 10V and a current of 10A is passed between an auxiliary current electrode and the grounding electrode, then the resistance is
1 ohm
The EGC for a flexible metal conduit connection to a motor supplied with a 20A circuit is
12 AWG
If you are bonding multiple disconnects and the size of the service conductor is 1,000 kcmil in a wire way, the size of the bonding jumper is
2/0 copper
Assuming the use of 75 Celsius copper conductors, a 200A commercial service would require
3/0 service conductor
The main bonding jumper for 3/0 service conductor is
4 AWG copper
A single-phase system has two legs, Legs A and Leg B. If Leg A is carrying 50A and Leg B is carrying 45A, the current carried by the neutral is
5A
When an equipment bonding jumper is installed outside, the length is limited to not more than
6 feet (1.8m)
When completing a three-point test, the potential electrode is placed at
62% of the current electrode distance
Which of the following is considered a separately derived system?
An emergency standby system with an isolated neutral
A ground rod must be installed in a coastal location and can only be driven halfway before encountering a rock shelf. One alternative is to
Bury the rod in a trench at least 30" (750mm) deep
Suppose a loose connection has an exposed bare conductor and it contacts the edge of a metal enclosure. Is this an example of a short circuit or ground fault
Ground fault
When using nonmetallic boxes with Type NM cable, the grounding wire
In not required to be connected to the box
When grounding at more than one building, the GEC at the second building is sized using
NEC Table 250.66